Where can a screw or nail be inserted to fasten a device box to a framing member?

The appropriate insertion point for a screw or nail to secure a device box to a framing member is specified as no more than 6 mm from the back or end of the enclosure. This requirement ensures that fasteners do not penetrate too deeply into the junction box, which could compromise the integrity of the enclosure or the wiring contained within. By anchoring the box at this specified distance, you maintain safety standards, preventing damage to internal components and ensuring that the box remains securely in place during installation and use.

Other options suggest fastening the box either too far from the back, which could lead to instability, or imply no standard regarding the placement concerning the box's center. Such practices may lead to complications during installation, potentially affecting both the device box's functionality and the overall safety of the electrical installation. The rule of maintaining a distance of no more than 6 mm strikes a balance between secure attachment and protection of internal structure and wiring.